Initially ExcellentSeries teasers are where you try to complete the sequence of a series of letters, numbers or objects.
What are the next three letters in this series?
T, T, F, S, E, T, S, N, T, T, T, T, _, _, _
AnswerF, F, F
These are the first letters of the prime numbers smaller than fifty:
Two, Three, Five, Seven, Eleven, Thirteen, Seventeen, Nineteen, Twenty-three, Twenty-nine, Thirty-one, Thirty-seven, Forty-one, Forty-three, Forty-seven
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